i’ll give a cookie to whoever answers

(multiple choice.)
which of the following best describes the pattern 2, 4, 8, 16.....?
a.) n, 2n, 3n, 4n
b.) n, 2n, 4n, 8n
c.) n, n^2, n^4, n^8
d.) n, n + 2, n + 4, n + 8